对给定树的权重以 X 为因子进行计数
原文: https://www.geeksforgeeks.org/count-the-nodes-of-the-given-tree-whose-weight-has-x-as-a-factor/
给定一棵树,以及所有节点的权重,任务是计算权重可被x
整除的节点。
示例:
输入: x = 5 输出:2 只有节点 1 和 2 的权重可被 5 整除。
方法:在树上执行 dfs ,对于每个节点,检查其权重是否可被 x 整除。 如果是,则增加计数。
实施:
C++
// C++ implementation of the approach
#include <bits/stdc++.h>
using namespace std;
long ans = 0;
int x;
vector<int> graph[100];
vector<int> weight(100);
// Function to perform dfs
void dfs(int node, int parent)
{
// If weight of the current node
// is divisible by x
if (weight[node] % x == 0)
ans += 1;
for (int to : graph[node]) {
if (to == parent)
continue;
dfs(to, node);
}
}
// Driver code
int main()
{
x = 5;
// Weights of the node
weight[1] = 5;
weight[2] = 10;
weight[3] = 11;
weight[4] = 8;
weight[5] = 6;
// Edges of the tree
graph[1].push_back(2);
graph[2].push_back(3);
graph[2].push_back(4);
graph[1].push_back(5);
dfs(1, 1);
cout << ans;
return 0;
}
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